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The EU AI Act enters its most significant enforcement phase on August 2, 2026, when penalties become fully applicable for General-Purpose AI (GPAI) model providers and high-risk AI systems. GPAI providers have been subject to obligations since August 2025, including technical documentation, EU copyright compliance, and training data summaries. Models exceeding 10^25 FLOP (systemic risk models like GPT-4 scale) face additional requirements: adversarial testing (red-teaming), incident reporting to the EU AI Office, cybersecurity measures, and energy efficiency reporting. Penalties for violations reach up to €35 million or 7% of global annual turnover. High-risk AI systems covering critical infrastructure, education, employment, essential services, law enforcement, and migration will also face full enforcement requiring conformity assessment, registration, human oversight, and transparency measures. European Commission Digital Strategy reported the core details. TechRepublic noted additional context. ISAR Global added corroborating details.